When the high-power 635nm diodes became available, I did some testing with these goggles. They seemed to pass more light than with the 660nm diodes, but i could not measure anything coming through them on my LPM. Out of an abundance of caution I changed our recommended nm range until more detailed testing could be completed. However, they should be fine for under 500mW of 635nm as noted by LaZeRz.